Parenthesized expression brackets stripped when they should not

```ts
const abc = (4 - 6 as number).toLocaleString()
```
Is translated to:
```lua
local abc = 4 - 6:toLocaleString()
```

I'm not entirely sure why this happens.

[Playground link](https://typescripttolua.github.io/play.html#src=const%20abc%20%3D%20(4%20-%206%20as%20number).toLocaleString())